*{
    padding: 0;
    margin: 0;
    box-sizing: border-box;
}
a{
    text-decoration: none;
}
ul,ol{
    list-style: none;
}
.clearfix::after{
    content: '';
    display: block;
    clear: both;
}
.fl{
    float: left;
}
.fr{
    float: right;
}
.w1200{
    width: 1200px;
    margin: 0 auto;
}